Answer: 4 - 7x = 15
Note:
To complete this problem without actually solving for x, you have to stop midway and there is your answer.
Explanation:
-(3x+10) = -3x-10
4(2-x) = 8-4x
(6-3x-10+8-4x)
6-10+8=4
Now, put the x's together, giving you 7x.
Your final answer will be
4-7x=15